ART: Include cleanup

Let clang-format reorder the header includes.

Derived with:

* .clang-format:
 BasedOnStyle: Google
 IncludeIsMainRegex: '(_test|-inl)?$'

* Steps:
 find . -name '*.cc' -o -name '*.h' | xargs sed -i.bak -e 's/^#include/ #include/' ; git commit -a -m 'ART: Include cleanup'
 git-clang-format -style=file HEAD^
 manual inspection
 git commit -a --amend

Test: mmma art
Change-Id: Ia963a8ce3ce5f96b5e78acd587e26908c7a70d02
diff --git a/runtime/base/casts.h b/runtime/base/casts.h
index c5b0af6..0cbabba 100644
--- a/runtime/base/casts.h
+++ b/runtime/base/casts.h
@@ -18,9 +18,10 @@
 #define ART_RUNTIME_BASE_CASTS_H_
 
 #include <assert.h>
-#include <limits>
 #include <stdint.h>
 #include <string.h>
+
+#include <limits>
 #include <type_traits>
 
 #include "base/logging.h"